CN116599469B - Load modulation power amplifier structure capable of improving average efficiency of rollback area - Google Patents
Load modulation power amplifier structure capable of improving average efficiency of rollback area Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a load modulation power amplifier structure capable of improving average efficiency of a rollback area, which belongs to the field of amplifiers and comprises a power divider, a first balance amplifier, a second balance amplifier, an input quadrature coupler, an output quadrature coupler and a Doherty power amplifier. The invention is based on the principle of a load modulation power amplifier and a Doherty power amplifier, the Doherty power amplifier is used as a control circuit to carry out load modulation on the load modulation balance power amplifier, meanwhile, the two paths of balance amplifiers in the load modulation balance power amplifier and the Doherty power amplifier form a multi-path Doherty power amplifier structure by controlling the starting time of the two paths of balance amplifiers, and finally, the invention can realize three rollback efficiency peaks in a relatively large rollback interval and can obtain better average efficiency.
Description
Technical Field
The invention relates to the field of amplifiers, in particular to a load modulation power amplifier structure capable of improving average efficiency of a rollback area.
Background
With the continuous increase of the demand of high-speed wireless communication, the improvement of the peak-to-average ratio of the modulation signal in the wireless communication is a key point for ensuring the high-speed information transmission rate in the wireless communication. The complex modulation signal with high peak-to-average ratio can make the power amplifier in the transmitter always in a power back-off state, and the power amplifier is the most power-consuming module in the whole system, so that higher requirements are put forth for the efficiency of the power amplifier in a large back-off interval. At present, the Doherty power amplifier is widely applied to a millimeter wave power amplifier to improve the rollback efficiency due to good performance and low complexity. Recently, a load modulation balanced power amplifier (LMBA) has also been proposed to improve the power amplifier back-off efficiency, and by using the characteristics of the quadrature coupler, it is possible to implement a relatively large power back-off, which is suitable for high-speed communication.
When designing a conventional Doherty power amplifier, the size of the main and auxiliary transistors is generally chosen to be the same so that their saturated output power capability is the same, the Doherty power amplifier can achieve a peak efficiency at 6-dB back-off, which is insufficient for an Orthogonal Frequency Division Multiplexing (OFDM) based 5GNR waveform. The two-way asymmetric Doherty can achieve deeper rollback efficiency peaks when the transistor size of the auxiliary way is required to be larger than that of the main way. But it may generate a valley between two peaks, which may seriously reduce the average efficiency in the entire back-off area, and may increase the average efficiency in the entire back-off area by increasing the number of auxiliary paths, but in this way, the design difficulty of the composite network may be greatly increased.
In the current LMBA structure, the output power of the control circuit is reasonably designed, a larger rollback interval can be realized, but the same problem is caused by an asymmetric two-way Doherty structure, a valley is generated between the efficiency peak value of the rollback point and the efficiency peak value of the saturation point, and the average efficiency in the whole rollback area is seriously reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a load modulation power amplifier structure capable of improving the average efficiency of a rollback area, and aims to realize a relatively large rollback interval, and a plurality of rollback efficiency peak points are arranged, so that the average efficiency in the whole rollback area is improved.
The aim of the invention is realized by the following technical scheme:
a load modulated power amplifier structure that improves the average efficiency of a back-off region, comprising: the power divider, the first balance amplifier, the second balance amplifier, the input quadrature coupler, the output quadrature coupler and the Doherty power amplifier;
the input end of the power divider is coupled with a radio frequency signal input RFin, the first output end of the power divider is coupled with the third port of the output quadrature coupler through the Doherty power amplifier, the second output end of the power divider is coupled with the second port of the input quadrature coupler, the first port of the input quadrature coupler is grounded, the third port of the input quadrature coupler is coupled with the second port of the output quadrature coupler through a first balance amplifier, the fourth port of the input quadrature coupler is coupled with the first port of the output quadrature coupler through a second balance amplifier, and the fourth port of the output quadrature coupler provides a radio frequency output signal RFout;
the Doherty power amplifier comprises a main path power amplifier and an auxiliary path power amplifier which are connected in parallel.
Further, a phase shifter is coupled between the second output of the power divider and the second port of the input quadrature coupler.
Further, the Doherty power amplifier further comprises a shunt quadrature coupler, a first port of the shunt quadrature coupler is grounded, a second port of the shunt quadrature coupler is coupled to the first output end of the power divider, a third port of the shunt quadrature coupler is coupled to the third port of the output quadrature coupler through the main power amplifier, and a fourth port of the shunt quadrature coupler is coupled to the third port of the output quadrature coupler through the auxiliary power amplifier.
Further, the Doherty power amplifier further comprises a first transformer and a second transformer, one end of a primary coil of the first transformer is connected with the output end of the main power amplifier, the other end of the primary coil of the second transformer is grounded, one end of a primary coil of the second transformer is connected with the output end of the auxiliary power amplifier, the other end of the primary coil of the second transformer is grounded, one end of a secondary coil of the first transformer is connected with one end of a secondary coil of the second transformer in series, the other end of the secondary coil of the first transformer is grounded, and the other end of the secondary coil of the first transformer is connected with a third port of the output quadrature coupler.
Further, the Doherty power amplifier further comprises a resistance wire connected between the secondary winding of the first transformer and the secondary winding of the second transformer.
Further, a first isolation resistor coupled between the first port of the input quadrature coupler and ground is included.
Further, the Doherty power amplifier further comprises a second isolation resistor coupled between the first port of the shunt quadrature coupler and ground.
Further, the main circuit power amplifier works in the AB type mode, and the auxiliary circuit power amplifier, the first balance amplifier and the second balance amplifier all work in the C type mode.
The beneficial effects of the invention are as follows:
1) The traditional single-path amplifier is replaced by the Doherty power amplifier, so that the traditional LMBA is additionally provided with a rollback efficiency peak point in a rollback interval, and a larger rollback interval and average efficiency are realized.
2) In the invention, the two balance amplifiers are started as two control paths at different time, on the premise of not losing saturated output power, one efficiency peak point can be continuously increased in a rollback interval, on the other hand, if the two control paths are started at the same time, a gain curve can be raised to a certain extent, the linearity problem exists, and the linearity problem can be relieved to a certain extent by selecting the control paths to be started at different time.
Drawings
Fig. 1 is a circuit structure of a load modulation power amplifier capable of improving the average efficiency of a back-off region;
fig. 2 is a circuit configuration of a parallel Doherty PA;
fig. 3 is a circuit configuration of a serial Doherty PA;
FIG. 4 is a graph showing the voltage, current, impedance and efficiency of a parallel-type Doherty PA or a series-type Doherty PA with an input voltage, wherein (a) is a graph showing the relationship between the input voltage and the equivalent current of a main power amplifier and an auxiliary power amplifier, (B) is a graph showing the relationship between the input voltage and the equivalent voltage of a main power amplifier and an auxiliary power amplifier, (c) is a graph showing the relationship between the input voltage and the equivalent impedance of a main power amplifier and an auxiliary power amplifier, and (d) is a graph showing the relationship between the input voltage and the efficiency of a DPA and a power amplifier biased in Class-B;
fig. 5 is an equivalent structure I of a conventional three-way Doherty power amplifier;
fig. 6 is an equivalent structure II of a conventional three-way Doherty power amplifier;
fig. 7 is a circuit configuration of a conventional load modulation balanced power amplifier (LMBA);
fig. 8 is a schematic diagram of port excitation for an equivalent model of a quadrature coupler.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The traditional Doherty Power Amplifier (DPA) comprises a main circuit power amplifier and an auxiliary circuit power amplifier which are connected in parallel, and a shunt quadrature coupler, wherein a circuit where the main circuit power amplifier is located is a main circuit, and a circuit where the auxiliary circuit power amplifier is located is an auxiliary circuit. The split quadrature coupler distributes the input signal to the main and auxiliary circuits, and when the input power is increased to the back-off point, the main power amplifier starts to operate, and then the impedance seen by the main power amplifier at the combining point increases with the increase of the input power. The traditional Doherty PA also comprises a quarter-wavelength transmission line which is arranged between the main power amplifier and the power synthesis point, wherein the quarter-wavelength transmission line is mainly used for impedance transformation, and aims to play a role in reducing the apparent impedance of the main circuit power amplifier when the auxiliary power amplifier works, ensure that the active load impedance formed by the circuit and the following circuit becomes low when the auxiliary power amplifier works, and ensure that the output current of the main power amplifier becomes large, so that the whole Doherty PA is always in a high-efficiency working state. However, for harmonic frequency points, the impedance transformation effect of the quarter-wavelength transmission line cannot be controlled, so that the Doherty PA cannot achieve the harmonic suppression effect.
The simplified parallel-type Doherty PA and serial-type Doherty PA have circuit structures shown in figures 2-3, respectively, and have current [ ]i m, i a ) Voltage [ ], voltage ]v m, v a ) Impedance%Z m, Z a ) And efficiency with input voltage as shown in fig. 4, it can be seen that the apparent impedance of the Doherty PA (DPA) gradually decreases with increasing power, while its efficiency has a peak point in the back-off interval.
When designing a conventional Doherty PA, the main and auxiliary power amplifiers are chosen to have the same size, so that their saturated output power capabilities are the same, and the Doherty PA can achieve a peak efficiency at 6-dB back-off. In order to increase the average efficiency in the back-off area, one possible solution is to increase the number of auxiliary circuits, but such a synthetic network is difficult to design, and the equivalent structures of two common three-way Doherty power amplifiers are shown in fig. 5 and 6, which each include a Carrier power amplifier (Carrier) and two peak power amplifiers (peak). In general, the output power of the Doherty PA is determined by the main circuit, and the load impedance of the main circuit is modulated by the auxiliary circuit, so that the drain voltage swing of the main circuit is kept to be the maximum, and thus, the relatively high efficiency in the back-off interval is maintained.
On the other hand, the load modulation balanced power amplifier (LMBA) may also realize an improvement in the power amplifier back-off efficiency by utilizing the characteristics of the quadrature coupler. As shown in fig. 7, the conventional LMBA is composed of three power amplifiers, including a control circuit power amplifier (CA), two balance circuit power amplifiers (BAs), where the control circuit power amplifier is located, and where the balance circuit power amplifier is located, is a balance circuit. The working principle is that an input end decomposes an input signal into two orthogonal signals (with the phase difference of 90 degrees) with equal amplitude through one orthogonal coupler, and the two orthogonal signals enter a direct-current end and a coupling end of an output coupler after being amplified by two balanced circuit power amplifiers. And a control signal is injected into the isolation section of the output coupler through CA, and the size and the phase of the control signal are reasonably designed, so that the load impedance of the two balanced-path power amplifiers is correctly modulated, and the rollback efficiency is improved.
Referring to fig. 1-8, the present invention provides a technical solution:
in this embodiment, a load modulation power amplifier structure capable of improving average efficiency of a back-off region includes: the power divider, the first balance amplifier, the second balance amplifier, the input quadrature coupler, the output quadrature coupler and the Doherty power amplifier;
the input end of the power divider is coupled with a radio frequency signal input RFin, the first output end of the power divider is coupled with the third port of the output quadrature coupler through the Doherty power amplifier, the second output end of the power divider is coupled with the second port of the input quadrature coupler, the first port of the input quadrature coupler is grounded, the third port of the input quadrature coupler is coupled with the second port of the output quadrature coupler through a first balance amplifier, the fourth port of the input quadrature coupler is coupled with the first port of the output quadrature coupler through a second balance amplifier, and the fourth port of the output quadrature coupler provides a radio frequency output signal RFout;
the Doherty power amplifier comprises a Main path power amplifier (Main) and an Auxiliary path power amplifier (Auxiliary), wherein the Main path power amplifier and the Auxiliary path power amplifier are connected in parallel.
In this embodiment, the Doherty power amplifier further includes a shunt quadrature coupler, a first port of the shunt quadrature coupler is grounded, a second port of the shunt quadrature coupler is coupled to the first output end of the power divider, a third port of the shunt quadrature coupler is coupled to the third port of the output quadrature coupler through the main power amplifier, and a fourth port of the shunt quadrature coupler is coupled to the third port of the output quadrature coupler through the auxiliary power amplifier.
The power divider equally inputs the radio frequency signal RFin to the input quadrature coupler and the Doherty power amplifier, and the split quadrature coupler in the input quadrature coupler and the Doherty power amplifier equally divides the signal output by the power divider, so that four paths of signals with equal amplitude and different phases exist in the circuit structure of the embodiment, and the signals are respectively coupled to the main path power amplifier, the auxiliary path power amplifier, the first balance amplifier and the second balance amplifier.
In this embodiment, the input quadrature coupler and the shunt quadrature coupler are configured to generate quadrature signals, and the output quadrature coupler is configured to perform active load modulation and output an amplified radio frequency output signal RFout. The input quadrature coupler, the output quadrature coupler and the quadrature coupler are all 3dB quadrature couplers. The quadrature coupler has a key role in the generation of quadrature signals of millimeter wave circuits and systems, and is an important component in a Doherty power amplifier and a load modulation balanced power amplifier (LMBA). As shown IN fig. 8, IN the equivalent model of the quadrature coupler, four ports of the quadrature coupler are reciprocal, for example, IN this embodiment, a first port of the input quadrature coupler is an isolated port (ISO), a second port is an input port (IN), a third port is a Coupled Port (CPL), a fourth port is a through port (THRU), power of the input port is equally distributed to the coupled port and the through port, and a phase difference of 90 degrees exists between the coupled port and the through port.
The input port (IN) of the quadrature coupler of fig. 8 is stimulated, the remaining ports being connected to the load impedance Z 0 The voltages of the other ports after odd-even mode analysis are respectively as follows:
wherein,is imaginary unit, ++>，/>，/>Andcharacteristic impedance of even and odd modes, respectively, < >>Is a couplerElectrical length.
The impedance matrix of the coupler is:
wherein,，/>，/>and->Representing the voltage and current at the different ports of the coupler, respectively.
When the length of the coupler isWhen (I)>，/>The voltage amplitude of the coupling end and the through end are equal, the phase difference is 90 degrees, and the impedance matrix of the quadrature coupler is further obtained as follows:
wherein Z is 0 Load impedance for the transmission line.
The Doherty power amplifier further comprises a first transformer and a second transformer, wherein one end of a primary coil of the first transformer is connected with the output end of the main power amplifier, the other end of the primary coil of the second transformer is grounded, one end of a primary coil of the second transformer is connected with the output end of the auxiliary power amplifier, the other end of the primary coil of the second transformer is grounded, one end of a secondary coil of the first transformer is connected with one end of a secondary coil of the second transformer in series, the other end of the secondary coil of the first transformer is grounded, and the other end of the secondary coil of the first transformer is connected with a third port of the output quadrature coupler. The Doherty power amplifier further comprises a resistance wire connected between the secondary coil of the first transformer and the secondary coil of the second transformer. The structure formed by the first transformer and the second transformer is characterized in that signals of a main power amplifier and an auxiliary power amplifier are serially output to a third port of an output quadrature coupler on one hand, namely a Doherty power amplifier is used as a control circuit of a load modulation power amplifier (LMBA); on the other hand, the quarter-wavelength transmission line is equivalently designed into a transformer structure, the transformer area is smaller, the structure is more compact, the area of the Doherty structure is further reduced while the rollback efficiency of the power amplifier is improved, the connection loss is reduced, and the overall performance of the power amplifier is improved.
In this embodiment, a phase shifter is further included that is coupled between the second output of the power divider and the second port of the input quadrature coupler. The phase shifter shifts the phase of the two output signals of the power divider to a certain extent to further ensure that the first and second balanced amplifiers are turned on at different times.
In this embodiment, the input quadrature coupler further comprises a first isolation resistor Z coupled between the first port and the ground iso1 The Doherty power amplifier further comprises a second isolation resistor Z coupled between the first port of the shunt quadrature coupler and the ground iso2 . The isolation resistor is connected with the isolation end of the quadrature coupler, and can well isolate input signals and output signals.
In this embodiment, the main power amplifier operates in the class AB mode, and the auxiliary power amplifier, the first balance amplifier, and the second balance amplifier all operate in the class C mode.
In this embodiment, based on the principles of the load modulation power amplifier and the Doherty power amplifier, the Doherty power amplifier is used as a control circuit to perform load modulation on the load modulation balance power amplifier, and meanwhile, two paths of balance amplifiers in the load modulation balance power amplifier and the Doherty power amplifier form a multi-path Doherty power amplifier structure, so that the invention can achieve better average efficiency in a rollback interval by controlling the on time of the two paths of balance amplifiers.
Working principle: as shown in fig. 1, when the load modulation power amplifier structure capable of improving the average efficiency of the back-off region starts to work, the main circuit in the Doherty power amplifier is always in a working state, and as the input power increases, the auxiliary circuit in the Doherty power amplifier starts to work, at this time, two balanced circuits are not started yet, the impedance seen by the balanced circuit direction output quadrature coupler is infinite, and at this time, the radio frequency output is the output of the Doherty power amplifier. With the increase of the input power, the first balanced amplifier BA1 is turned on gradually, and at this time, the impedance of the second balanced amplifier BA2 viewed toward the output quadrature coupler is infinity, and the first balanced amplifier BA1 and the Doherty power amplifier form a circuit structure similar to a three-way Doherty power amplifier. Along with the continuous increase of input power, the second balance amplifier BA2 is gradually started, at this time, the Doherty power amplifier is used as a control circuit power amplifier (CA) to form an LMBA together with the balance amplifiers BA1 and BA2, correct load modulation can be completed at the load ends of the BA1 and BA2 through reasonably designing a phase-shifting compensation network, and finally the Doherty power amplifier and the BA1 and BA2 are jointly output at the output ends of the output quadrature coupler.
The traditional LMBA only has one rollback efficiency peak point, and the Doherty PA is used as a control circuit power amplifier CA, so that one rollback efficiency peak point is added in a rollback interval, and a larger rollback interval and average efficiency are realized. In the invention, the first balance amplifier BA1 and the second balance amplifier BA2 are used as control circuits of the Doherty power amplifier and are not simultaneously started, so that an efficiency peak point can be continuously increased in a rollback interval on the premise of not losing saturated output power. On the other hand, if BA1 and BA2 are turned on simultaneously, the gain curve will be tilted up to some extent, which results in linearity problem, while selecting BA1 and BA2 not to be turned on simultaneously will alleviate the linearity problem to some extent.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (6)
1. A load modulation power amplifier structure capable of improving the average efficiency of a back-off region, comprising: the power divider, the first balance amplifier, the second balance amplifier, the input quadrature coupler, the output quadrature coupler and the Doherty power amplifier;
the input end of the power divider is coupled with a radio frequency signal input RFin, the first output end of the power divider is coupled with the third port of the output quadrature coupler through the Doherty power amplifier, the second output end of the power divider is coupled with the second port of the input quadrature coupler, the first port of the input quadrature coupler is grounded, the third port of the input quadrature coupler is coupled with the second port of the output quadrature coupler through a first balance amplifier, the fourth port of the input quadrature coupler is coupled with the first port of the output quadrature coupler through a second balance amplifier, and the fourth port of the output quadrature coupler provides a radio frequency output signal RFout;
the Doherty power amplifier comprises a main path power amplifier and an auxiliary path power amplifier which are connected in parallel;
the Doherty power amplifier further comprises a shunt quadrature coupler, wherein a first port of the shunt quadrature coupler is grounded, a second port of the shunt quadrature coupler is coupled with a first output end of the power divider, a third port of the shunt quadrature coupler is coupled with a third port of the output quadrature coupler through the main path power amplifier, and a fourth port of the shunt quadrature coupler is coupled with a third port of the output quadrature coupler through the auxiliary path power amplifier;
the Doherty power amplifier further comprises a first transformer and a second transformer, wherein one end of a primary coil of the first transformer is connected with the output end of the main power amplifier, the other end of the primary coil of the second transformer is grounded, one end of a primary coil of the second transformer is connected with the output end of the auxiliary power amplifier, the other end of the primary coil of the second transformer is grounded, one end of a secondary coil of the first transformer is connected with one end of a secondary coil of the second transformer in series, the other end of the secondary coil of the first transformer is grounded, and the other end of the secondary coil of the first transformer is connected with a third port of the output quadrature coupler;
with the increase of the input power, the first balance amplifier is gradually started, at the moment, the impedance of the second balance amplifier seen to the output orthogonal coupler is infinity, and the first balance amplifier and the Doherty power amplifier form a circuit structure of a three-way Doherty power amplifier; along with the continuous increase of the input power, the second balance amplifier is gradually started, and the Doherty power amplifier is used as a control circuit power amplifier to form a load modulation balance power amplifier together with the first balance amplifier and the second balance amplifier.
2. The load modulation power amplifier structure of claim 1, wherein the average efficiency of the back-off region is improved, and wherein: a phase shifter is coupled between the second output of the power divider and the second port of the input quadrature coupler.
3. The load modulation power amplifier structure of claim 1, wherein the average efficiency of the back-off region is improved, and wherein: the Doherty power amplifier further comprises a resistance wire connected between the secondary coil of the first transformer and the secondary coil of the second transformer.
4. The load modulation power amplifier structure of claim 1, wherein the average efficiency of the back-off region is improved, and wherein: a first isolation resistor coupled between the first port of the input quadrature coupler and ground is also included.
5. The load modulation power amplifier structure of claim 1, wherein the average efficiency of the back-off region is improved, and wherein: the Doherty power amplifier further comprises a second isolation resistor coupled between the first port of the shunt quadrature coupler and ground.
6. The load modulation power amplifier structure of claim 1, wherein the average efficiency of the back-off region is improved, and wherein: the main path power amplifier works in an AB mode, and the auxiliary path power amplifier, the first balance amplifier and the second balance amplifier all work in a C mode.
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| CN116366007A (en) * | 2023-04-11 | 2023-06-30 | 杭州电子科技大学 | Load modulation multimode fusion power amplifier and design method thereof |
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| US20220255506A1 (en) * | 2021-02-08 | 2022-08-11 | University Of Central Florida Research Foundation, Inc. | Reconfigurable asymmetrical load-modulated balanced amplifiers |
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| EP2568598A1 (en) * | 2011-09-06 | 2013-03-13 | Alcatel Lucent | Power amplifier for mobile telecommunications |
| CN111740703A (en) * | 2020-05-25 | 2020-10-02 | 杭州电子科技大学 | pseudo-Doherty type self-input controlled load modulation balanced power amplifier and implementation method thereof |
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| CN116366007A (en) * | 2023-04-11 | 2023-06-30 | 杭州电子科技大学 | Load modulation multimode fusion power amplifier and design method thereof |
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